Malicious PDF — malware analysis report

Static analysis result for SHA-256 d26327c394d602bb…

MALICIOUS

PDF

79.9 KB Created: 2021-09-08 19:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 1b038a5134795510738a012e6bbad205 SHA-1: 48d77853ae34c99d167192150b80e424ee0548eb SHA-256: d26327c394d602bb7a60922abe984d757ffdd9560b00da0b26ba71db89b63d45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous PDF links on disposable hosting further supports a malicious campaign, likely for SEO manipulation or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://piri-piri.pl/ckfinder/userfiles/files/xifitijuwulominegabapi.pdf In PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/setovafivubelu.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/12518126979.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/73948305673.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/kulufitoguk.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/dunusu.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/paxevomumavamebekuvotosi.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/vowafanudukojolapopefa.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/fa55dae7807302fee348c3198f6a409a/pilalabudusamisijino.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/joteb.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kazaleginekurufaro.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630528532.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/80879619376.pdfIn PDF document text
    • http://methese.com/upload/files/37962027922.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/nexunizenabexizimotavaga.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/28061433474.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/semigeralesabolizor.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/bafidasolejoditej.pdfIn PDF document text
    • https://andana.us/files/files/83819489371.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/0ddua28mk3fh2hgca3l0vgacpu/66630032175.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/wesotalof.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/4spjvdn1igrchl18d8keu02mee/wawuzekawexan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=musicoterapia+alzheimer+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD458 10932 bytes
SHA-256: a0fecafc273cb91bc77ad0388fff33866032627f86bf08831ab00fb406661147
font_01_sfnt_off0000edb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB6 17104 bytes
SHA-256: 0e807d8954bd4a463d1e81b69e79e7721a9beebe26c8948192cf28813e03c13f
font_02_sfnt_off00011a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1